Which of the following statements is accurate regarding venting appliances?

The statement that vent capacity must be assessed for safety is accurate because it highlights the critical importance of ensuring that venting systems can handle the output from appliances without risking backdrafting or other hazardous situations. Venting systems must be designed to accommodate the specific types of appliances being used, the volume of combustion gases produced, and the dynamics of air flow to maintain safe operation.

Assessing vent capacity involves evaluating factors such as size, material, and configuration of the venting system in relation to the appliances it serves. Improper vent sizing or configuration can lead to insufficient venting, causing dangerous conditions like the buildup of carbon monoxide in living spaces. Therefore, ensuring that venting systems are properly sized and assessed for each specific appliance setup is essential for safety and compliance with applicable codes and standards.

The other options imply overly broad or incorrect practices regarding venting appliances, which underscores the importance of careful assessment.